Rating System

LEED BD+C: New Construction, LEED BD+C: New Construction, LEED ID+C: Commercial Interiors, LEED BD+C: Core and Shell

Rating System Version

v2 - LEED 2.2, v3 - LEED 2009, v3 - LEED 2009, v3 - LEED 2009

Inquiry

Background: This project is using underfloor air distribution (UFAD) as the main HVAC system. Passive floor-mounted swirl-type diffusers (manually operated by the occupants for interior "cooling-only" zones. They will not be controlled via thermostats. The perimeter zones will be served by UFAD fan powered units (with electric heat for heating) and will be controlled via space mounted thermostats. The prerequisite requires compliance with ASHRAE 90.1-2004, section 6.4. Section 6.4.3.1.1 states: "The supply of heating and cooling energy to each zone shall be individually controlled by thermostatic controls responding to temperature within the zone". Question: Does the use of passive floor mounted diffusers in the UFAD system and controlled as described above meet the requirements of ASHRAE 90.1-2004, section 6.4.3.1.1 and this prerequisite?